]> git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - net/ipv6/ip6_gre.c
projects / mirror_ubuntu-focal-kernel.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
ASoC: tlv320aic31xx: Reset registers during power up
[mirror_ubuntu-focal-kernel.git] / net / ipv6 / ip6_gre.c
1 /*
2 * GRE over IPv6 protocol decoder.
3 *
4 * Authors: Dmitry Kozlov (xeb@mail.ru)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 *
11 */
12
13 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
15 #include <linux/capability.h>
16 #include <linux/module.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/skbuff.h>
22 #include <linux/netdevice.h>
23 #include <linux/in.h>
24 #include <linux/tcp.h>
25 #include <linux/udp.h>
26 #include <linux/if_arp.h>
27 #include <linux/init.h>
28 #include <linux/in6.h>
29 #include <linux/inetdevice.h>
30 #include <linux/igmp.h>
31 #include <linux/netfilter_ipv4.h>
32 #include <linux/etherdevice.h>
33 #include <linux/if_ether.h>
34 #include <linux/hash.h>
35 #include <linux/if_tunnel.h>
36 #include <linux/ip6_tunnel.h>
37
38 #include <net/sock.h>
39 #include <net/ip.h>
40 #include <net/ip_tunnels.h>
41 #include <net/icmp.h>
42 #include <net/protocol.h>
43 #include <net/addrconf.h>
44 #include <net/arp.h>
45 #include <net/checksum.h>
46 #include <net/dsfield.h>
47 #include <net/inet_ecn.h>
48 #include <net/xfrm.h>
49 #include <net/net_namespace.h>
50 #include <net/netns/generic.h>
51 #include <net/rtnetlink.h>
52
53 #include <net/ipv6.h>
54 #include <net/ip6_fib.h>
55 #include <net/ip6_route.h>
56 #include <net/ip6_tunnel.h>
57 #include <net/gre.h>
58
59
60 static bool log_ecn_error = true;
61 module_param(log_ecn_error, bool, 0644);
62 MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
63
64 #define IP6_GRE_HASH_SIZE_SHIFT 5
65 #define IP6_GRE_HASH_SIZE (1 << IP6_GRE_HASH_SIZE_SHIFT)
66
67 static unsigned int ip6gre_net_id __read_mostly;
68 struct ip6gre_net {
69 struct ip6_tnl __rcu *tunnels[4][IP6_GRE_HASH_SIZE];
70
71 struct net_device *fb_tunnel_dev;
72 };
73
74 static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
75 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly;
76 static int ip6gre_tunnel_init(struct net_device *dev);
77 static void ip6gre_tunnel_setup(struct net_device *dev);
78 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
79 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
80
81 /* Tunnel hash table */
82
83 /*
84 4 hash tables:
85
86 3: (remote,local)
87 2: (remote,*)
88 1: (*,local)
89 0: (*,*)
90
91 We require exact key match i.e. if a key is present in packet
92 it will match only tunnel with the same key; if it is not present,
93 it will match only keyless tunnel.
94
95 All keysless packets, if not matched configured keyless tunnels
96 will match fallback tunnel.
97 */
98
99 #define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(IP6_GRE_HASH_SIZE - 1))
100 static u32 HASH_ADDR(const struct in6_addr *addr)
101 {
102 u32 hash = ipv6_addr_hash(addr);
103
104 return hash_32(hash, IP6_GRE_HASH_SIZE_SHIFT);
105 }
106
107 #define tunnels_r_l tunnels[3]
108 #define tunnels_r tunnels[2]
109 #define tunnels_l tunnels[1]
110 #define tunnels_wc tunnels[0]
111
112 /* Given src, dst and key, find appropriate for input tunnel. */
113
114 static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
115 const struct in6_addr *remote, const struct in6_addr *local,
116 __be32 key, __be16 gre_proto)
117 {
118 struct net *net = dev_net(dev);
119 int link = dev->ifindex;
120 unsigned int h0 = HASH_ADDR(remote);
121 unsigned int h1 = HASH_KEY(key);
122 struct ip6_tnl *t, *cand = NULL;
123 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
124 int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
125 ARPHRD_ETHER : ARPHRD_IP6GRE;
126 int score, cand_score = 4;
127
128 for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
129 if (!ipv6_addr_equal(local, &t->parms.laddr) ||
130 !ipv6_addr_equal(remote, &t->parms.raddr) ||
131 key != t->parms.i_key ||
132 !(t->dev->flags & IFF_UP))
133 continue;
134
135 if (t->dev->type != ARPHRD_IP6GRE &&
136 t->dev->type != dev_type)
137 continue;
138
139 score = 0;
140 if (t->parms.link != link)
141 score |= 1;
142 if (t->dev->type != dev_type)
143 score |= 2;
144 if (score == 0)
145 return t;
146
147 if (score < cand_score) {
148 cand = t;
149 cand_score = score;
150 }
151 }
152
153 for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
154 if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
155 key != t->parms.i_key ||
156 !(t->dev->flags & IFF_UP))
157 continue;
158
159 if (t->dev->type != ARPHRD_IP6GRE &&
160 t->dev->type != dev_type)
161 continue;
162
163 score = 0;
164 if (t->parms.link != link)
165 score |= 1;
166 if (t->dev->type != dev_type)
167 score |= 2;
168 if (score == 0)
169 return t;
170
171 if (score < cand_score) {
172 cand = t;
173 cand_score = score;
174 }
175 }
176
177 for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
178 if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
179 (!ipv6_addr_equal(local, &t->parms.raddr) ||
180 !ipv6_addr_is_multicast(local))) ||
181 key != t->parms.i_key ||
182 !(t->dev->flags & IFF_UP))
183 continue;
184
185 if (t->dev->type != ARPHRD_IP6GRE &&
186 t->dev->type != dev_type)
187 continue;
188
189 score = 0;
190 if (t->parms.link != link)
191 score |= 1;
192 if (t->dev->type != dev_type)
193 score |= 2;
194 if (score == 0)
195 return t;
196
197 if (score < cand_score) {
198 cand = t;
199 cand_score = score;
200 }
201 }
202
203 for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
204 if (t->parms.i_key != key ||
205 !(t->dev->flags & IFF_UP))
206 continue;
207
208 if (t->dev->type != ARPHRD_IP6GRE &&
209 t->dev->type != dev_type)
210 continue;
211
212 score = 0;
213 if (t->parms.link != link)
214 score |= 1;
215 if (t->dev->type != dev_type)
216 score |= 2;
217 if (score == 0)
218 return t;
219
220 if (score < cand_score) {
221 cand = t;
222 cand_score = score;
223 }
224 }
225
226 if (cand)
227 return cand;
228
229 dev = ign->fb_tunnel_dev;
230 if (dev->flags & IFF_UP)
231 return netdev_priv(dev);
232
233 return NULL;
234 }
235
236 static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
237 const struct __ip6_tnl_parm *p)
238 {
239 const struct in6_addr *remote = &p->raddr;
240 const struct in6_addr *local = &p->laddr;
241 unsigned int h = HASH_KEY(p->i_key);
242 int prio = 0;
243
244 if (!ipv6_addr_any(local))
245 prio |= 1;
246 if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
247 prio |= 2;
248 h ^= HASH_ADDR(remote);
249 }
250
251 return &ign->tunnels[prio][h];
252 }
253
254 static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
255 const struct ip6_tnl *t)
256 {
257 return __ip6gre_bucket(ign, &t->parms);
258 }
259
260 static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
261 {
262 struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
263
264 rcu_assign_pointer(t->next, rtnl_dereference(*tp));
265 rcu_assign_pointer(*tp, t);
266 }
267
268 static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
269 {
270 struct ip6_tnl __rcu **tp;
271 struct ip6_tnl *iter;
272
273 for (tp = ip6gre_bucket(ign, t);
274 (iter = rtnl_dereference(*tp)) != NULL;
275 tp = &iter->next) {
276 if (t == iter) {
277 rcu_assign_pointer(*tp, t->next);
278 break;
279 }
280 }
281 }
282
283 static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
284 const struct __ip6_tnl_parm *parms,
285 int type)
286 {
287 const struct in6_addr *remote = &parms->raddr;
288 const struct in6_addr *local = &parms->laddr;
289 __be32 key = parms->i_key;
290 int link = parms->link;
291 struct ip6_tnl *t;
292 struct ip6_tnl __rcu **tp;
293 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
294
295 for (tp = __ip6gre_bucket(ign, parms);
296 (t = rtnl_dereference(*tp)) != NULL;
297 tp = &t->next)
298 if (ipv6_addr_equal(local, &t->parms.laddr) &&
299 ipv6_addr_equal(remote, &t->parms.raddr) &&
300 key == t->parms.i_key &&
301 link == t->parms.link &&
302 type == t->dev->type)
303 break;
304
305 return t;
306 }
307
308 static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
309 const struct __ip6_tnl_parm *parms, int create)
310 {
311 struct ip6_tnl *t, *nt;
312 struct net_device *dev;
313 char name[IFNAMSIZ];
314 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
315
316 t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
317 if (t && create)
318 return NULL;
319 if (t || !create)
320 return t;
321
322 if (parms->name[0])
323 strlcpy(name, parms->name, IFNAMSIZ);
324 else
325 strcpy(name, "ip6gre%d");
326
327 dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
328 ip6gre_tunnel_setup);
329 if (!dev)
330 return NULL;
331
332 dev_net_set(dev, net);
333
334 nt = netdev_priv(dev);
335 nt->parms = *parms;
336 dev->rtnl_link_ops = &ip6gre_link_ops;
337
338 nt->dev = dev;
339 nt->net = dev_net(dev);
340 ip6gre_tnl_link_config(nt, 1);
341
342 if (register_netdevice(dev) < 0)
343 goto failed_free;
344
345 /* Can use a lockless transmit, unless we generate output sequences */
346 if (!(nt->parms.o_flags & TUNNEL_SEQ))
347 dev->features |= NETIF_F_LLTX;
348
349 dev_hold(dev);
350 ip6gre_tunnel_link(ign, nt);
351 return nt;
352
353 failed_free:
354 free_netdev(dev);
355 return NULL;
356 }
357
358 static void ip6gre_tunnel_uninit(struct net_device *dev)
359 {
360 struct ip6_tnl *t = netdev_priv(dev);
361 struct ip6gre_net *ign = net_generic(t->net, ip6gre_net_id);
362
363 ip6gre_tunnel_unlink(ign, t);
364 dst_cache_reset(&t->dst_cache);
365 dev_put(dev);
366 }
367
368
369 static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
370 u8 type, u8 code, int offset, __be32 info)
371 {
372 struct net *net = dev_net(skb->dev);
373 const struct gre_base_hdr *greh;
374 const struct ipv6hdr *ipv6h;
375 int grehlen = sizeof(*greh);
376 struct ip6_tnl *t;
377 int key_off = 0;
378 __be16 flags;
379 __be32 key;
380
381 if (!pskb_may_pull(skb, offset + grehlen))
382 return;
383 greh = (const struct gre_base_hdr *)(skb->data + offset);
384 flags = greh->flags;
385 if (flags & (GRE_VERSION | GRE_ROUTING))
386 return;
387 if (flags & GRE_CSUM)
388 grehlen += 4;
389 if (flags & GRE_KEY) {
390 key_off = grehlen + offset;
391 grehlen += 4;
392 }
393
394 if (!pskb_may_pull(skb, offset + grehlen))
395 return;
396 ipv6h = (const struct ipv6hdr *)skb->data;
397 greh = (const struct gre_base_hdr *)(skb->data + offset);
398 key = key_off ? *(__be32 *)(skb->data + key_off) : 0;
399
400 t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
401 key, greh->protocol);
402 if (!t)
403 return;
404
405 switch (type) {
406 struct ipv6_tlv_tnl_enc_lim *tel;
407 __u32 teli;
408 case ICMPV6_DEST_UNREACH:
409 net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
410 t->parms.name);
411 if (code != ICMPV6_PORT_UNREACH)
412 break;
413 return;
414 case ICMPV6_TIME_EXCEED:
415 if (code == ICMPV6_EXC_HOPLIMIT) {
416 net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
417 t->parms.name);
418 break;
419 }
420 return;
421 case ICMPV6_PARAMPROB:
422 teli = 0;
423 if (code == ICMPV6_HDR_FIELD)
424 teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
425
426 if (teli && teli == be32_to_cpu(info) - 2) {
427 tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
428 if (tel->encap_limit == 0) {
429 net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
430 t->parms.name);
431 }
432 } else {
433 net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
434 t->parms.name);
435 }
436 return;
437 case ICMPV6_PKT_TOOBIG:
438 ip6_update_pmtu(skb, net, info, 0, 0, sock_net_uid(net, NULL));
439 return;
440 case NDISC_REDIRECT:
441 ip6_redirect(skb, net, skb->dev->ifindex, 0,
442 sock_net_uid(net, NULL));
443 return;
444 }
445
446 if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
447 t->err_count++;
448 else
449 t->err_count = 1;
450 t->err_time = jiffies;
451 }
452
453 static int ip6gre_rcv(struct sk_buff *skb, const struct tnl_ptk_info *tpi)
454 {
455 const struct ipv6hdr *ipv6h;
456 struct ip6_tnl *tunnel;
457
458 ipv6h = ipv6_hdr(skb);
459 tunnel = ip6gre_tunnel_lookup(skb->dev,
460 &ipv6h->saddr, &ipv6h->daddr, tpi->key,
461 tpi->proto);
462 if (tunnel) {
463 ip6_tnl_rcv(tunnel, skb, tpi, NULL, log_ecn_error);
464
465 return PACKET_RCVD;
466 }
467
468 return PACKET_REJECT;
469 }
470
471 static int gre_rcv(struct sk_buff *skb)
472 {
473 struct tnl_ptk_info tpi;
474 bool csum_err = false;
475 int hdr_len;
476
477 hdr_len = gre_parse_header(skb, &tpi, &csum_err, htons(ETH_P_IPV6), 0);
478 if (hdr_len < 0)
479 goto drop;
480
481 if (iptunnel_pull_header(skb, hdr_len, tpi.proto, false))
482 goto drop;
483
484 if (ip6gre_rcv(skb, &tpi) == PACKET_RCVD)
485 return 0;
486
487 icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
488 drop:
489 kfree_skb(skb);
490 return 0;
491 }
492
493 static int gre_handle_offloads(struct sk_buff *skb, bool csum)
494 {
495 return iptunnel_handle_offloads(skb,
496 csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE);
497 }
498
499 static netdev_tx_t __gre6_xmit(struct sk_buff *skb,
500 struct net_device *dev, __u8 dsfield,
501 struct flowi6 *fl6, int encap_limit,
502 __u32 *pmtu, __be16 proto)
503 {
504 struct ip6_tnl *tunnel = netdev_priv(dev);
505 __be16 protocol;
506
507 if (dev->type == ARPHRD_ETHER)
508 IPCB(skb)->flags = 0;
509
510 if (dev->header_ops && dev->type == ARPHRD_IP6GRE)
511 fl6->daddr = ((struct ipv6hdr *)skb->data)->daddr;
512 else
513 fl6->daddr = tunnel->parms.raddr;
514
515 if (tunnel->parms.o_flags & TUNNEL_SEQ)
516 tunnel->o_seqno++;
517
518 /* Push GRE header. */
519 protocol = (dev->type == ARPHRD_ETHER) ? htons(ETH_P_TEB) : proto;
520 gre_build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
521 protocol, tunnel->parms.o_key, htonl(tunnel->o_seqno));
522
523 return ip6_tnl_xmit(skb, dev, dsfield, fl6, encap_limit, pmtu,
524 NEXTHDR_GRE);
525 }
526
527 static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
528 {
529 struct ip6_tnl *t = netdev_priv(dev);
530 const struct iphdr *iph = ip_hdr(skb);
531 int encap_limit = -1;
532 struct flowi6 fl6;
533 __u8 dsfield;
534 __u32 mtu;
535 int err;
536
537 memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
538
539 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
540 encap_limit = t->parms.encap_limit;
541
542 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
543
544 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
545 dsfield = ipv4_get_dsfield(iph);
546 else
547 dsfield = ip6_tclass(t->parms.flowinfo);
548 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
549 fl6.flowi6_mark = skb->mark;
550 else
551 fl6.flowi6_mark = t->parms.fwmark;
552
553 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
554
555 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
556 if (err)
557 return -1;
558
559 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
560 skb->protocol);
561 if (err != 0) {
562 /* XXX: send ICMP error even if DF is not set. */
563 if (err == -EMSGSIZE)
564 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
565 htonl(mtu));
566 return -1;
567 }
568
569 return 0;
570 }
571
572 static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
573 {
574 struct ip6_tnl *t = netdev_priv(dev);
575 struct ipv6hdr *ipv6h = ipv6_hdr(skb);
576 int encap_limit = -1;
577 __u16 offset;
578 struct flowi6 fl6;
579 __u8 dsfield;
580 __u32 mtu;
581 int err;
582
583 if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
584 return -1;
585
586 offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
587 /* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
588 ipv6h = ipv6_hdr(skb);
589
590 if (offset > 0) {
591 struct ipv6_tlv_tnl_enc_lim *tel;
592 tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
593 if (tel->encap_limit == 0) {
594 icmpv6_send(skb, ICMPV6_PARAMPROB,
595 ICMPV6_HDR_FIELD, offset + 2);
596 return -1;
597 }
598 encap_limit = tel->encap_limit - 1;
599 } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
600 encap_limit = t->parms.encap_limit;
601
602 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
603
604 if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
605 dsfield = ipv6_get_dsfield(ipv6h);
606 else
607 dsfield = ip6_tclass(t->parms.flowinfo);
608
609 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
610 fl6.flowlabel |= ip6_flowlabel(ipv6h);
611 if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
612 fl6.flowi6_mark = skb->mark;
613 else
614 fl6.flowi6_mark = t->parms.fwmark;
615
616 fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
617
618 if (gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM)))
619 return -1;
620
621 err = __gre6_xmit(skb, dev, dsfield, &fl6, encap_limit,
622 &mtu, skb->protocol);
623 if (err != 0) {
624 if (err == -EMSGSIZE)
625 icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
626 return -1;
627 }
628
629 return 0;
630 }
631
632 /**
633 * ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
634 * @t: the outgoing tunnel device
635 * @hdr: IPv6 header from the incoming packet
636 *
637 * Description:
638 * Avoid trivial tunneling loop by checking that tunnel exit-point
639 * doesn't match source of incoming packet.
640 *
641 * Return:
642 * 1 if conflict,
643 * 0 else
644 **/
645
646 static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
647 const struct ipv6hdr *hdr)
648 {
649 return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
650 }
651
652 static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
653 {
654 struct ip6_tnl *t = netdev_priv(dev);
655 int encap_limit = -1;
656 struct flowi6 fl6;
657 __u32 mtu;
658 int err;
659
660 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
661 encap_limit = t->parms.encap_limit;
662
663 memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
664
665 err = gre_handle_offloads(skb, !!(t->parms.o_flags & TUNNEL_CSUM));
666 if (err)
667 return err;
668
669 err = __gre6_xmit(skb, dev, 0, &fl6, encap_limit, &mtu, skb->protocol);
670
671 return err;
672 }
673
674 static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
675 struct net_device *dev)
676 {
677 struct ip6_tnl *t = netdev_priv(dev);
678 struct net_device_stats *stats = &t->dev->stats;
679 int ret;
680
681 if (!ip6_tnl_xmit_ctl(t, &t->parms.laddr, &t->parms.raddr))
682 goto tx_err;
683
684 switch (skb->protocol) {
685 case htons(ETH_P_IP):
686 ret = ip6gre_xmit_ipv4(skb, dev);
687 break;
688 case htons(ETH_P_IPV6):
689 ret = ip6gre_xmit_ipv6(skb, dev);
690 break;
691 default:
692 ret = ip6gre_xmit_other(skb, dev);
693 break;
694 }
695
696 if (ret < 0)
697 goto tx_err;
698
699 return NETDEV_TX_OK;
700
701 tx_err:
702 stats->tx_errors++;
703 stats->tx_dropped++;
704 kfree_skb(skb);
705 return NETDEV_TX_OK;
706 }
707
708 static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
709 {
710 struct net_device *dev = t->dev;
711 struct __ip6_tnl_parm *p = &t->parms;
712 struct flowi6 *fl6 = &t->fl.u.ip6;
713 int t_hlen;
714
715 if (dev->type != ARPHRD_ETHER) {
716 memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
717 memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
718 }
719
720 /* Set up flowi template */
721 fl6->saddr = p->laddr;
722 fl6->daddr = p->raddr;
723 fl6->flowi6_oif = p->link;
724 fl6->flowlabel = 0;
725 fl6->flowi6_proto = IPPROTO_GRE;
726
727 if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
728 fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
729 if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
730 fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
731
732 p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
733 p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
734
735 if (p->flags&IP6_TNL_F_CAP_XMIT &&
736 p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
737 dev->flags |= IFF_POINTOPOINT;
738 else
739 dev->flags &= ~IFF_POINTOPOINT;
740
741 t->tun_hlen = gre_calc_hlen(t->parms.o_flags);
742
743 t->hlen = t->encap_hlen + t->tun_hlen;
744
745 t_hlen = t->hlen + sizeof(struct ipv6hdr);
746
747 if (p->flags & IP6_TNL_F_CAP_XMIT) {
748 int strict = (ipv6_addr_type(&p->raddr) &
749 (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
750
751 struct rt6_info *rt = rt6_lookup(t->net,
752 &p->raddr, &p->laddr,
753 p->link, strict);
754
755 if (!rt)
756 return;
757
758 if (rt->dst.dev) {
759 dev->hard_header_len = rt->dst.dev->hard_header_len +
760 t_hlen;
761
762 if (set_mtu) {
763 dev->mtu = rt->dst.dev->mtu - t_hlen;
764 if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
765 dev->mtu -= 8;
766 if (dev->type == ARPHRD_ETHER)
767 dev->mtu -= ETH_HLEN;
768
769 if (dev->mtu < IPV6_MIN_MTU)
770 dev->mtu = IPV6_MIN_MTU;
771 }
772 }
773 ip6_rt_put(rt);
774 }
775 }
776
777 static int ip6gre_tnl_change(struct ip6_tnl *t,
778 const struct __ip6_tnl_parm *p, int set_mtu)
779 {
780 t->parms.laddr = p->laddr;
781 t->parms.raddr = p->raddr;
782 t->parms.flags = p->flags;
783 t->parms.hop_limit = p->hop_limit;
784 t->parms.encap_limit = p->encap_limit;
785 t->parms.flowinfo = p->flowinfo;
786 t->parms.link = p->link;
787 t->parms.proto = p->proto;
788 t->parms.i_key = p->i_key;
789 t->parms.o_key = p->o_key;
790 t->parms.i_flags = p->i_flags;
791 t->parms.o_flags = p->o_flags;
792 t->parms.fwmark = p->fwmark;
793 dst_cache_reset(&t->dst_cache);
794 ip6gre_tnl_link_config(t, set_mtu);
795 return 0;
796 }
797
798 static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
799 const struct ip6_tnl_parm2 *u)
800 {
801 p->laddr = u->laddr;
802 p->raddr = u->raddr;
803 p->flags = u->flags;
804 p->hop_limit = u->hop_limit;
805 p->encap_limit = u->encap_limit;
806 p->flowinfo = u->flowinfo;
807 p->link = u->link;
808 p->i_key = u->i_key;
809 p->o_key = u->o_key;
810 p->i_flags = gre_flags_to_tnl_flags(u->i_flags);
811 p->o_flags = gre_flags_to_tnl_flags(u->o_flags);
812 memcpy(p->name, u->name, sizeof(u->name));
813 }
814
815 static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
816 const struct __ip6_tnl_parm *p)
817 {
818 u->proto = IPPROTO_GRE;
819 u->laddr = p->laddr;
820 u->raddr = p->raddr;
821 u->flags = p->flags;
822 u->hop_limit = p->hop_limit;
823 u->encap_limit = p->encap_limit;
824 u->flowinfo = p->flowinfo;
825 u->link = p->link;
826 u->i_key = p->i_key;
827 u->o_key = p->o_key;
828 u->i_flags = gre_tnl_flags_to_gre_flags(p->i_flags);
829 u->o_flags = gre_tnl_flags_to_gre_flags(p->o_flags);
830 memcpy(u->name, p->name, sizeof(u->name));
831 }
832
833 static int ip6gre_tunnel_ioctl(struct net_device *dev,
834 struct ifreq *ifr, int cmd)
835 {
836 int err = 0;
837 struct ip6_tnl_parm2 p;
838 struct __ip6_tnl_parm p1;
839 struct ip6_tnl *t = netdev_priv(dev);
840 struct net *net = t->net;
841 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
842
843 memset(&p1, 0, sizeof(p1));
844
845 switch (cmd) {
846 case SIOCGETTUNNEL:
847 if (dev == ign->fb_tunnel_dev) {
848 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
849 err = -EFAULT;
850 break;
851 }
852 ip6gre_tnl_parm_from_user(&p1, &p);
853 t = ip6gre_tunnel_locate(net, &p1, 0);
854 if (!t)
855 t = netdev_priv(dev);
856 }
857 memset(&p, 0, sizeof(p));
858 ip6gre_tnl_parm_to_user(&p, &t->parms);
859 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
860 err = -EFAULT;
861 break;
862
863 case SIOCADDTUNNEL:
864 case SIOCCHGTUNNEL:
865 err = -EPERM;
866 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
867 goto done;
868
869 err = -EFAULT;
870 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
871 goto done;
872
873 err = -EINVAL;
874 if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
875 goto done;
876
877 if (!(p.i_flags&GRE_KEY))
878 p.i_key = 0;
879 if (!(p.o_flags&GRE_KEY))
880 p.o_key = 0;
881
882 ip6gre_tnl_parm_from_user(&p1, &p);
883 t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
884
885 if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
886 if (t) {
887 if (t->dev != dev) {
888 err = -EEXIST;
889 break;
890 }
891 } else {
892 t = netdev_priv(dev);
893
894 ip6gre_tunnel_unlink(ign, t);
895 synchronize_net();
896 ip6gre_tnl_change(t, &p1, 1);
897 ip6gre_tunnel_link(ign, t);
898 netdev_state_change(dev);
899 }
900 }
901
902 if (t) {
903 err = 0;
904
905 memset(&p, 0, sizeof(p));
906 ip6gre_tnl_parm_to_user(&p, &t->parms);
907 if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
908 err = -EFAULT;
909 } else
910 err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
911 break;
912
913 case SIOCDELTUNNEL:
914 err = -EPERM;
915 if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
916 goto done;
917
918 if (dev == ign->fb_tunnel_dev) {
919 err = -EFAULT;
920 if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
921 goto done;
922 err = -ENOENT;
923 ip6gre_tnl_parm_from_user(&p1, &p);
924 t = ip6gre_tunnel_locate(net, &p1, 0);
925 if (!t)
926 goto done;
927 err = -EPERM;
928 if (t == netdev_priv(ign->fb_tunnel_dev))
929 goto done;
930 dev = t->dev;
931 }
932 unregister_netdevice(dev);
933 err = 0;
934 break;
935
936 default:
937 err = -EINVAL;
938 }
939
940 done:
941 return err;
942 }
943
944 static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
945 unsigned short type, const void *daddr,
946 const void *saddr, unsigned int len)
947 {
948 struct ip6_tnl *t = netdev_priv(dev);
949 struct ipv6hdr *ipv6h;
950 __be16 *p;
951
952 ipv6h = skb_push(skb, t->hlen + sizeof(*ipv6h));
953 ip6_flow_hdr(ipv6h, 0, ip6_make_flowlabel(dev_net(dev), skb,
954 t->fl.u.ip6.flowlabel,
955 true, &t->fl.u.ip6));
956 ipv6h->hop_limit = t->parms.hop_limit;
957 ipv6h->nexthdr = NEXTHDR_GRE;
958 ipv6h->saddr = t->parms.laddr;
959 ipv6h->daddr = t->parms.raddr;
960
961 p = (__be16 *)(ipv6h + 1);
962 p[0] = t->parms.o_flags;
963 p[1] = htons(type);
964
965 /*
966 * Set the source hardware address.
967 */
968
969 if (saddr)
970 memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
971 if (daddr)
972 memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
973 if (!ipv6_addr_any(&ipv6h->daddr))
974 return t->hlen;
975
976 return -t->hlen;
977 }
978
979 static const struct header_ops ip6gre_header_ops = {
980 .create = ip6gre_header,
981 };
982
983 static const struct net_device_ops ip6gre_netdev_ops = {
984 .ndo_init = ip6gre_tunnel_init,
985 .ndo_uninit = ip6gre_tunnel_uninit,
986 .ndo_start_xmit = ip6gre_tunnel_xmit,
987 .ndo_do_ioctl = ip6gre_tunnel_ioctl,
988 .ndo_change_mtu = ip6_tnl_change_mtu,
989 .ndo_get_stats64 = ip_tunnel_get_stats64,
990 .ndo_get_iflink = ip6_tnl_get_iflink,
991 };
992
993 static void ip6gre_dev_free(struct net_device *dev)
994 {
995 struct ip6_tnl *t = netdev_priv(dev);
996
997 dst_cache_destroy(&t->dst_cache);
998 free_percpu(dev->tstats);
999 }
1000
1001 static void ip6gre_tunnel_setup(struct net_device *dev)
1002 {
1003 dev->netdev_ops = &ip6gre_netdev_ops;
1004 dev->needs_free_netdev = true;
1005 dev->priv_destructor = ip6gre_dev_free;
1006
1007 dev->type = ARPHRD_IP6GRE;
1008
1009 dev->flags |= IFF_NOARP;
1010 dev->addr_len = sizeof(struct in6_addr);
1011 netif_keep_dst(dev);
1012 /* This perm addr will be used as interface identifier by IPv6 */
1013 dev->addr_assign_type = NET_ADDR_RANDOM;
1014 eth_random_addr(dev->perm_addr);
1015 }
1016
1017 static int ip6gre_tunnel_init_common(struct net_device *dev)
1018 {
1019 struct ip6_tnl *tunnel;
1020 int ret;
1021 int t_hlen;
1022
1023 tunnel = netdev_priv(dev);
1024
1025 tunnel->dev = dev;
1026 tunnel->net = dev_net(dev);
1027 strcpy(tunnel->parms.name, dev->name);
1028
1029 dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1030 if (!dev->tstats)
1031 return -ENOMEM;
1032
1033 ret = dst_cache_init(&tunnel->dst_cache, GFP_KERNEL);
1034 if (ret) {
1035 free_percpu(dev->tstats);
1036 dev->tstats = NULL;
1037 return ret;
1038 }
1039
1040 tunnel->tun_hlen = gre_calc_hlen(tunnel->parms.o_flags);
1041 tunnel->hlen = tunnel->tun_hlen + tunnel->encap_hlen;
1042 t_hlen = tunnel->hlen + sizeof(struct ipv6hdr);
1043
1044 dev->hard_header_len = LL_MAX_HEADER + t_hlen;
1045 dev->mtu = ETH_DATA_LEN - t_hlen;
1046 if (dev->type == ARPHRD_ETHER)
1047 dev->mtu -= ETH_HLEN;
1048 if (!(tunnel->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
1049 dev->mtu -= 8;
1050
1051 return 0;
1052 }
1053
1054 static int ip6gre_tunnel_init(struct net_device *dev)
1055 {
1056 struct ip6_tnl *tunnel;
1057 int ret;
1058
1059 ret = ip6gre_tunnel_init_common(dev);
1060 if (ret)
1061 return ret;
1062
1063 tunnel = netdev_priv(dev);
1064
1065 memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
1066 memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
1067
1068 if (ipv6_addr_any(&tunnel->parms.raddr))
1069 dev->header_ops = &ip6gre_header_ops;
1070
1071 return 0;
1072 }
1073
1074 static void ip6gre_fb_tunnel_init(struct net_device *dev)
1075 {
1076 struct ip6_tnl *tunnel = netdev_priv(dev);
1077
1078 tunnel->dev = dev;
1079 tunnel->net = dev_net(dev);
1080 strcpy(tunnel->parms.name, dev->name);
1081
1082 tunnel->hlen = sizeof(struct ipv6hdr) + 4;
1083
1084 dev_hold(dev);
1085 }
1086
1087
1088 static struct inet6_protocol ip6gre_protocol __read_mostly = {
1089 .handler = gre_rcv,
1090 .err_handler = ip6gre_err,
1091 .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
1092 };
1093
1094 static void ip6gre_destroy_tunnels(struct net *net, struct list_head *head)
1095 {
1096 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1097 struct net_device *dev, *aux;
1098 int prio;
1099
1100 for_each_netdev_safe(net, dev, aux)
1101 if (dev->rtnl_link_ops == &ip6gre_link_ops ||
1102 dev->rtnl_link_ops == &ip6gre_tap_ops)
1103 unregister_netdevice_queue(dev, head);
1104
1105 for (prio = 0; prio < 4; prio++) {
1106 int h;
1107 for (h = 0; h < IP6_GRE_HASH_SIZE; h++) {
1108 struct ip6_tnl *t;
1109
1110 t = rtnl_dereference(ign->tunnels[prio][h]);
1111
1112 while (t) {
1113 /* If dev is in the same netns, it has already
1114 * been added to the list by the previous loop.
1115 */
1116 if (!net_eq(dev_net(t->dev), net))
1117 unregister_netdevice_queue(t->dev,
1118 head);
1119 t = rtnl_dereference(t->next);
1120 }
1121 }
1122 }
1123 }
1124
1125 static int __net_init ip6gre_init_net(struct net *net)
1126 {
1127 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1128 int err;
1129
1130 ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
1131 NET_NAME_UNKNOWN,
1132 ip6gre_tunnel_setup);
1133 if (!ign->fb_tunnel_dev) {
1134 err = -ENOMEM;
1135 goto err_alloc_dev;
1136 }
1137 dev_net_set(ign->fb_tunnel_dev, net);
1138 /* FB netdevice is special: we have one, and only one per netns.
1139 * Allowing to move it to another netns is clearly unsafe.
1140 */
1141 ign->fb_tunnel_dev->features |= NETIF_F_NETNS_LOCAL;
1142
1143
1144 ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
1145 ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
1146
1147 err = register_netdev(ign->fb_tunnel_dev);
1148 if (err)
1149 goto err_reg_dev;
1150
1151 rcu_assign_pointer(ign->tunnels_wc[0],
1152 netdev_priv(ign->fb_tunnel_dev));
1153 return 0;
1154
1155 err_reg_dev:
1156 free_netdev(ign->fb_tunnel_dev);
1157 err_alloc_dev:
1158 return err;
1159 }
1160
1161 static void __net_exit ip6gre_exit_batch_net(struct list_head *net_list)
1162 {
1163 struct net *net;
1164 LIST_HEAD(list);
1165
1166 rtnl_lock();
1167 list_for_each_entry(net, net_list, exit_list)
1168 ip6gre_destroy_tunnels(net, &list);
1169 unregister_netdevice_many(&list);
1170 rtnl_unlock();
1171 }
1172
1173 static struct pernet_operations ip6gre_net_ops = {
1174 .init = ip6gre_init_net,
1175 .exit_batch = ip6gre_exit_batch_net,
1176 .id = &ip6gre_net_id,
1177 .size = sizeof(struct ip6gre_net),
1178 };
1179
1180 static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[],
1181 struct netlink_ext_ack *extack)
1182 {
1183 __be16 flags;
1184
1185 if (!data)
1186 return 0;
1187
1188 flags = 0;
1189 if (data[IFLA_GRE_IFLAGS])
1190 flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
1191 if (data[IFLA_GRE_OFLAGS])
1192 flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
1193 if (flags & (GRE_VERSION|GRE_ROUTING))
1194 return -EINVAL;
1195
1196 return 0;
1197 }
1198
1199 static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[],
1200 struct netlink_ext_ack *extack)
1201 {
1202 struct in6_addr daddr;
1203
1204 if (tb[IFLA_ADDRESS]) {
1205 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
1206 return -EINVAL;
1207 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
1208 return -EADDRNOTAVAIL;
1209 }
1210
1211 if (!data)
1212 goto out;
1213
1214 if (data[IFLA_GRE_REMOTE]) {
1215 daddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1216 if (ipv6_addr_any(&daddr))
1217 return -EINVAL;
1218 }
1219
1220 out:
1221 return ip6gre_tunnel_validate(tb, data, extack);
1222 }
1223
1224
1225 static void ip6gre_netlink_parms(struct nlattr *data[],
1226 struct __ip6_tnl_parm *parms)
1227 {
1228 memset(parms, 0, sizeof(*parms));
1229
1230 if (!data)
1231 return;
1232
1233 if (data[IFLA_GRE_LINK])
1234 parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
1235
1236 if (data[IFLA_GRE_IFLAGS])
1237 parms->i_flags = gre_flags_to_tnl_flags(
1238 nla_get_be16(data[IFLA_GRE_IFLAGS]));
1239
1240 if (data[IFLA_GRE_OFLAGS])
1241 parms->o_flags = gre_flags_to_tnl_flags(
1242 nla_get_be16(data[IFLA_GRE_OFLAGS]));
1243
1244 if (data[IFLA_GRE_IKEY])
1245 parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
1246
1247 if (data[IFLA_GRE_OKEY])
1248 parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
1249
1250 if (data[IFLA_GRE_LOCAL])
1251 parms->laddr = nla_get_in6_addr(data[IFLA_GRE_LOCAL]);
1252
1253 if (data[IFLA_GRE_REMOTE])
1254 parms->raddr = nla_get_in6_addr(data[IFLA_GRE_REMOTE]);
1255
1256 if (data[IFLA_GRE_TTL])
1257 parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
1258
1259 if (data[IFLA_GRE_ENCAP_LIMIT])
1260 parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
1261
1262 if (data[IFLA_GRE_FLOWINFO])
1263 parms->flowinfo = nla_get_be32(data[IFLA_GRE_FLOWINFO]);
1264
1265 if (data[IFLA_GRE_FLAGS])
1266 parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
1267
1268 if (data[IFLA_GRE_FWMARK])
1269 parms->fwmark = nla_get_u32(data[IFLA_GRE_FWMARK]);
1270 }
1271
1272 static int ip6gre_tap_init(struct net_device *dev)
1273 {
1274 struct ip6_tnl *tunnel;
1275 int ret;
1276
1277 ret = ip6gre_tunnel_init_common(dev);
1278 if (ret)
1279 return ret;
1280
1281 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1282
1283 tunnel = netdev_priv(dev);
1284
1285 ip6gre_tnl_link_config(tunnel, 1);
1286
1287 return 0;
1288 }
1289
1290 static const struct net_device_ops ip6gre_tap_netdev_ops = {
1291 .ndo_init = ip6gre_tap_init,
1292 .ndo_uninit = ip6gre_tunnel_uninit,
1293 .ndo_start_xmit = ip6gre_tunnel_xmit,
1294 .ndo_set_mac_address = eth_mac_addr,
1295 .ndo_validate_addr = eth_validate_addr,
1296 .ndo_change_mtu = ip6_tnl_change_mtu,
1297 .ndo_get_stats64 = ip_tunnel_get_stats64,
1298 .ndo_get_iflink = ip6_tnl_get_iflink,
1299 };
1300
1301 #define GRE6_FEATURES (NETIF_F_SG | \
1302 NETIF_F_FRAGLIST | \
1303 NETIF_F_HIGHDMA | \
1304 NETIF_F_HW_CSUM)
1305
1306 static void ip6gre_tap_setup(struct net_device *dev)
1307 {
1308
1309 ether_setup(dev);
1310
1311 dev->netdev_ops = &ip6gre_tap_netdev_ops;
1312 dev->needs_free_netdev = true;
1313 dev->priv_destructor = ip6gre_dev_free;
1314
1315 dev->features |= NETIF_F_NETNS_LOCAL;
1316 dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1317 dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
1318 netif_keep_dst(dev);
1319 }
1320
1321 static bool ip6gre_netlink_encap_parms(struct nlattr *data[],
1322 struct ip_tunnel_encap *ipencap)
1323 {
1324 bool ret = false;
1325
1326 memset(ipencap, 0, sizeof(*ipencap));
1327
1328 if (!data)
1329 return ret;
1330
1331 if (data[IFLA_GRE_ENCAP_TYPE]) {
1332 ret = true;
1333 ipencap->type = nla_get_u16(data[IFLA_GRE_ENCAP_TYPE]);
1334 }
1335
1336 if (data[IFLA_GRE_ENCAP_FLAGS]) {
1337 ret = true;
1338 ipencap->flags = nla_get_u16(data[IFLA_GRE_ENCAP_FLAGS]);
1339 }
1340
1341 if (data[IFLA_GRE_ENCAP_SPORT]) {
1342 ret = true;
1343 ipencap->sport = nla_get_be16(data[IFLA_GRE_ENCAP_SPORT]);
1344 }
1345
1346 if (data[IFLA_GRE_ENCAP_DPORT]) {
1347 ret = true;
1348 ipencap->dport = nla_get_be16(data[IFLA_GRE_ENCAP_DPORT]);
1349 }
1350
1351 return ret;
1352 }
1353
1354 static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
1355 struct nlattr *tb[], struct nlattr *data[],
1356 struct netlink_ext_ack *extack)
1357 {
1358 struct ip6_tnl *nt;
1359 struct net *net = dev_net(dev);
1360 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1361 struct ip_tunnel_encap ipencap;
1362 int err;
1363
1364 nt = netdev_priv(dev);
1365
1366 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1367 int err = ip6_tnl_encap_setup(nt, &ipencap);
1368
1369 if (err < 0)
1370 return err;
1371 }
1372
1373 ip6gre_netlink_parms(data, &nt->parms);
1374
1375 if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
1376 return -EEXIST;
1377
1378 if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
1379 eth_hw_addr_random(dev);
1380
1381 nt->dev = dev;
1382 nt->net = dev_net(dev);
1383 ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
1384
1385 dev->features |= GRE6_FEATURES;
1386 dev->hw_features |= GRE6_FEATURES;
1387
1388 if (!(nt->parms.o_flags & TUNNEL_SEQ)) {
1389 /* TCP offload with GRE SEQ is not supported, nor
1390 * can we support 2 levels of outer headers requiring
1391 * an update.
1392 */
1393 if (!(nt->parms.o_flags & TUNNEL_CSUM) ||
1394 (nt->encap.type == TUNNEL_ENCAP_NONE)) {
1395 dev->features |= NETIF_F_GSO_SOFTWARE;
1396 dev->hw_features |= NETIF_F_GSO_SOFTWARE;
1397 }
1398
1399 /* Can use a lockless transmit, unless we generate
1400 * output sequences
1401 */
1402 dev->features |= NETIF_F_LLTX;
1403 }
1404
1405 err = register_netdevice(dev);
1406 if (err)
1407 goto out;
1408
1409 dev_hold(dev);
1410 ip6gre_tunnel_link(ign, nt);
1411
1412 out:
1413 return err;
1414 }
1415
1416 static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
1417 struct nlattr *data[],
1418 struct netlink_ext_ack *extack)
1419 {
1420 struct ip6_tnl *t, *nt = netdev_priv(dev);
1421 struct net *net = nt->net;
1422 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1423 struct __ip6_tnl_parm p;
1424 struct ip_tunnel_encap ipencap;
1425
1426 if (dev == ign->fb_tunnel_dev)
1427 return -EINVAL;
1428
1429 if (ip6gre_netlink_encap_parms(data, &ipencap)) {
1430 int err = ip6_tnl_encap_setup(nt, &ipencap);
1431
1432 if (err < 0)
1433 return err;
1434 }
1435
1436 ip6gre_netlink_parms(data, &p);
1437
1438 t = ip6gre_tunnel_locate(net, &p, 0);
1439
1440 if (t) {
1441 if (t->dev != dev)
1442 return -EEXIST;
1443 } else {
1444 t = nt;
1445 }
1446
1447 ip6gre_tunnel_unlink(ign, t);
1448 ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
1449 ip6gre_tunnel_link(ign, t);
1450 return 0;
1451 }
1452
1453 static void ip6gre_dellink(struct net_device *dev, struct list_head *head)
1454 {
1455 struct net *net = dev_net(dev);
1456 struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
1457
1458 if (dev != ign->fb_tunnel_dev)
1459 unregister_netdevice_queue(dev, head);
1460 }
1461
1462 static size_t ip6gre_get_size(const struct net_device *dev)
1463 {
1464 return
1465 /* IFLA_GRE_LINK */
1466 nla_total_size(4) +
1467 /* IFLA_GRE_IFLAGS */
1468 nla_total_size(2) +
1469 /* IFLA_GRE_OFLAGS */
1470 nla_total_size(2) +
1471 /* IFLA_GRE_IKEY */
1472 nla_total_size(4) +
1473 /* IFLA_GRE_OKEY */
1474 nla_total_size(4) +
1475 /* IFLA_GRE_LOCAL */
1476 nla_total_size(sizeof(struct in6_addr)) +
1477 /* IFLA_GRE_REMOTE */
1478 nla_total_size(sizeof(struct in6_addr)) +
1479 /* IFLA_GRE_TTL */
1480 nla_total_size(1) +
1481 /* IFLA_GRE_ENCAP_LIMIT */
1482 nla_total_size(1) +
1483 /* IFLA_GRE_FLOWINFO */
1484 nla_total_size(4) +
1485 /* IFLA_GRE_FLAGS */
1486 nla_total_size(4) +
1487 /* IFLA_GRE_ENCAP_TYPE */
1488 nla_total_size(2) +
1489 /* IFLA_GRE_ENCAP_FLAGS */
1490 nla_total_size(2) +
1491 /* IFLA_GRE_ENCAP_SPORT */
1492 nla_total_size(2) +
1493 /* IFLA_GRE_ENCAP_DPORT */
1494 nla_total_size(2) +
1495 /* IFLA_GRE_FWMARK */
1496 nla_total_size(4) +
1497 0;
1498 }
1499
1500 static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
1501 {
1502 struct ip6_tnl *t = netdev_priv(dev);
1503 struct __ip6_tnl_parm *p = &t->parms;
1504
1505 if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
1506 nla_put_be16(skb, IFLA_GRE_IFLAGS,
1507 gre_tnl_flags_to_gre_flags(p->i_flags)) ||
1508 nla_put_be16(skb, IFLA_GRE_OFLAGS,
1509 gre_tnl_flags_to_gre_flags(p->o_flags)) ||
1510 nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
1511 nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
1512 nla_put_in6_addr(skb, IFLA_GRE_LOCAL, &p->laddr) ||
1513 nla_put_in6_addr(skb, IFLA_GRE_REMOTE, &p->raddr) ||
1514 nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
1515 nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
1516 nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
1517 nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags) ||
1518 nla_put_u32(skb, IFLA_GRE_FWMARK, p->fwmark))
1519 goto nla_put_failure;
1520
1521 if (nla_put_u16(skb, IFLA_GRE_ENCAP_TYPE,
1522 t->encap.type) ||
1523 nla_put_be16(skb, IFLA_GRE_ENCAP_SPORT,
1524 t->encap.sport) ||
1525 nla_put_be16(skb, IFLA_GRE_ENCAP_DPORT,
1526 t->encap.dport) ||
1527 nla_put_u16(skb, IFLA_GRE_ENCAP_FLAGS,
1528 t->encap.flags))
1529 goto nla_put_failure;
1530
1531 return 0;
1532
1533 nla_put_failure:
1534 return -EMSGSIZE;
1535 }
1536
1537 static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
1538 [IFLA_GRE_LINK] = { .type = NLA_U32 },
1539 [IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
1540 [IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
1541 [IFLA_GRE_IKEY] = { .type = NLA_U32 },
1542 [IFLA_GRE_OKEY] = { .type = NLA_U32 },
1543 [IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
1544 [IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
1545 [IFLA_GRE_TTL] = { .type = NLA_U8 },
1546 [IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
1547 [IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
1548 [IFLA_GRE_FLAGS] = { .type = NLA_U32 },
1549 [IFLA_GRE_ENCAP_TYPE] = { .type = NLA_U16 },
1550 [IFLA_GRE_ENCAP_FLAGS] = { .type = NLA_U16 },
1551 [IFLA_GRE_ENCAP_SPORT] = { .type = NLA_U16 },
1552 [IFLA_GRE_ENCAP_DPORT] = { .type = NLA_U16 },
1553 [IFLA_GRE_FWMARK] = { .type = NLA_U32 },
1554 };
1555
1556 static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
1557 .kind = "ip6gre",
1558 .maxtype = IFLA_GRE_MAX,
1559 .policy = ip6gre_policy,
1560 .priv_size = sizeof(struct ip6_tnl),
1561 .setup = ip6gre_tunnel_setup,
1562 .validate = ip6gre_tunnel_validate,
1563 .newlink = ip6gre_newlink,
1564 .changelink = ip6gre_changelink,
1565 .dellink = ip6gre_dellink,
1566 .get_size = ip6gre_get_size,
1567 .fill_info = ip6gre_fill_info,
1568 .get_link_net = ip6_tnl_get_link_net,
1569 };
1570
1571 static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
1572 .kind = "ip6gretap",
1573 .maxtype = IFLA_GRE_MAX,
1574 .policy = ip6gre_policy,
1575 .priv_size = sizeof(struct ip6_tnl),
1576 .setup = ip6gre_tap_setup,
1577 .validate = ip6gre_tap_validate,
1578 .newlink = ip6gre_newlink,
1579 .changelink = ip6gre_changelink,
1580 .get_size = ip6gre_get_size,
1581 .fill_info = ip6gre_fill_info,
1582 .get_link_net = ip6_tnl_get_link_net,
1583 };
1584
1585 /*
1586 * And now the modules code and kernel interface.
1587 */
1588
1589 static int __init ip6gre_init(void)
1590 {
1591 int err;
1592
1593 pr_info("GRE over IPv6 tunneling driver\n");
1594
1595 err = register_pernet_device(&ip6gre_net_ops);
1596 if (err < 0)
1597 return err;
1598
1599 err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
1600 if (err < 0) {
1601 pr_info("%s: can't add protocol\n", __func__);
1602 goto add_proto_failed;
1603 }
1604
1605 err = rtnl_link_register(&ip6gre_link_ops);
1606 if (err < 0)
1607 goto rtnl_link_failed;
1608
1609 err = rtnl_link_register(&ip6gre_tap_ops);
1610 if (err < 0)
1611 goto tap_ops_failed;
1612
1613 out:
1614 return err;
1615
1616 tap_ops_failed:
1617 rtnl_link_unregister(&ip6gre_link_ops);
1618 rtnl_link_failed:
1619 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1620 add_proto_failed:
1621 unregister_pernet_device(&ip6gre_net_ops);
1622 goto out;
1623 }
1624
1625 static void __exit ip6gre_fini(void)
1626 {
1627 rtnl_link_unregister(&ip6gre_tap_ops);
1628 rtnl_link_unregister(&ip6gre_link_ops);
1629 inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
1630 unregister_pernet_device(&ip6gre_net_ops);
1631 }
1632
1633 module_init(ip6gre_init);
1634 module_exit(ip6gre_fini);
1635 MODULE_LICENSE("GPL");
1636 MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
1637 MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
1638 MODULE_ALIAS_RTNL_LINK("ip6gre");
1639 MODULE_ALIAS_RTNL_LINK("ip6gretap");
1640 MODULE_ALIAS_NETDEV("ip6gre0");
Ubuntu Focal Linux kernel mirror